National Gravity Compilation 2019: First Vertical Derivative Image of Australia

Nearly 1.4 million gravity stations from the Australian National Gravity Database, supplemented by global marine data, were used to create this 2019 grid. Geoscience Australia produced this image showing the first vertical derivative of de-trended global isostatic residual anomalies over Australia and its continental margins. The underlying gravity observations were collected by government, industry, and research bodies from the 1940s to 2019, with ground station spacing varying from 11 km to less than 1 km.

Use Cases

• Modeling geological structures and tectonic features based on gravity anomaly data.
• Aiding mineral and resource exploration by identifying subsurface density variations.
• Integrating with other geophysical datasets for comprehensive crustal studies.
• Calibrating or validating regional-scale geophysical models of the Australian continent.

Strengths

• Derived from nearly 1.4 million gravity stations in the national database.
• Data collection spans from the 1940s to 2019, providing a long-term baseline.
• Grid has a cell size of approximately 435 meters (0.00417 degrees).
• Quality-checked by Geoscience Australia geophysicists to be fit-for-purpose.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Ground station spacing is heterogeneous, ranging from 11 km to less than 1 km.
• Row count and specific file size are unknown, which may limit suitability assessment.

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State, Territory Governments, industry, and research organizations.

Collection Method

Processed from ground observations and offshore global gravity data using standard geophysical methods and Fast Fourier Transform (FFT).

Time Range

1940s to 2019 (observation period), with database snapshot as of September 2019.

Freshness

Last updated 2026-03-25 17:25:51.508754; freshness should be verified.

Geography

Australia and its continental margins.